User talk:Sds57

Welcome!
Hello, Sds57, and welcome to Wikipedia! Thank you for your contributions, especially what you did for Mutual information. I hope you like the place and decide to stay. Here are a few links to pages you might find helpful: Please remember to sign your messages on talk pages by typing four tildes ( ~ ); this will automatically insert your username and the date. If you need help, check out Questions, ask me on my talk page, or ask your question on this page and then place  before the question. Again, welcome! benmoore 17:20, 5 March 2014 (UTC)
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Empty sum
Hi! Thanks for answering the clarification requests at "empty sum". However, set union cannot be the monoid operation, as this would imply Sum(A) = Sum(A union A) = Sum(A) + Sum(A) for every set A. See also the new discussion at Talk:Empty sum - your contributions are wellcome there. - Jochen Burghardt (talk) 17:45, 31 July 2019 (UTC)